put the tin hat on (something)

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put the tin hat on (something)

To finalize, or finish off, or mark the end something, especially in a forceful, decisive, or dramatic way. Primarily heard in UK. What put the tin hat on it for me was his insistence that we maintain the same direction for the next financial year. I put in my resignation the very next day. The downgrading of the company's credit rating puts the tin hat on a disastrous year for their financial situation.
See also: hat, on, put, tin
References in periodicals archive ?
What put the tin hat on it for me was when the phone rang and someone called Madge wanted a few minutes of my time to answer a few questions about the way things are these days.
I thought watching them against Kildare last year was enough for me but this put the tin hat on it.